Hey there! I use the mouse buttons for strafing left and right. Left one works fine. The right one occasionally stops working if I'm doing too much at one time. Note that this doesn't happen in other 6DoF games, such as DXX-Retro or Sublevel Zero.

Hey there, sorry for getting back to you so late, but I finally got a chance to play a multiplayer game today for the first time. Weapons are going to take some getting used to, but it's still fun!

For the left and right mouse buttons, while I do have customization active for slide up/slide down (I map those via SteelSeries software that came with the mouse to Pad8 & Pad2 respectively), those work 100%. I do not alter the left and right mouse buttons, in fact I have those mapped as left and right in game. Let me play around with disabling that software and let you know what happens.

It happens a LOT less often when I disable my mouse customization software, but it DOES happen. I was switching from strafe left to strafe right, alternating banking between left and right, firing primaries, and going in reverse when I got it to happen last. I was using these four things, but I couldn't tell you in which order I pressed the buttons or overlapped them, as I cannot consistently reproduce it.
* Fire primary (left control)
* Bank left (Q)
* Bank right (W)
* Reverse (D)

I've reproduced this on the current release... I have my Steelseries mouse software turned completely off, and I managed it to reproduce on video using ONLY LMB & RMB. I also have NohBoard turned on so you can see my input.